I have a mauve Erisymum. Two years ago it was a tiny twig and just look at it now! It has bloomed throughout the winter and is a magnet for butterflies and bees. I actually counted seven different types of bumble bee on it, including a coal black species which I still haven't been able to identify, plus the honey-bee.
And as for butterflies, I have seen commas, peacocks, cabbage whites, painted ladies and orange-tips adorning its blossoms. Every garden should have one!